$(a)\;0.032\;m \\ (b)\;1.02\;m \\ (c)\;0.06\;m \\ (d)\;2.10\;m $

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Limit of resolution for small angle is given by

$ \theta_{min} =\large\frac{1.22 \lambda}{D}$

$\qquad= \large\frac{5550 \times 10^{-10}}{2.5 \times 10^{-3}} \times$$ 1.22$

$\qquad= 2.7 \times 10^{-4}$

Separation between objects

$ \qquad= \theta_{min} \times distance $

$\qquad= 2.7 \times 10^{-4} \times 120$

$\qquad= 0.032\;m$

Hence a is the correct answer.

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